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【題目】Before you hand in your final report, ________ there are no spelling mistakes.

A. make sure B. to make sure

C. made sure D. making sure

【答案】A

【解析】

試題分析:考查句子結(jié)構(gòu)。本句中有before引導(dǎo)的時間狀語從句,說明橫線句是一個完整的句子,而BCD三項都不能放在句首先從單獨的句子,而A項動詞原形放在句首構(gòu)成祈使句。句意:在你上交最終的報告之前,要確保沒有拼寫錯誤。故A正確。

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